That for the purpose of the conduct by a police officer of an investigation into an offence that has been committed or that the Commissioner believes to have committed, the use of a listening device is necessary; or That an offence is about to be, or is reasonably likely to be, committed and that, for the purpose of enabling a police officer to obtain evidence of the commission of the offence or the identity of the offender, the use of a listening device is necessary.
b) Que está próximo a cometerse un delito o que hay motivos razonables para suponer que se cometerá y que, a fin de que un agente de la policía pueda obtener pruebas de la comisión del delito o de la identidad del delincuente es necesario utilizar un dispositivo de escucha.